14bfc86ceSHeiko Carstens/* 24bfc86ceSHeiko Carstens * S390 low-level entry points. 34bfc86ceSHeiko Carstens * 44bfc86ceSHeiko Carstens * Copyright IBM Corp. 1999, 2012 54bfc86ceSHeiko Carstens * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 64bfc86ceSHeiko Carstens * Hartmut Penner (hp@de.ibm.com), 74bfc86ceSHeiko Carstens * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 84bfc86ceSHeiko Carstens * Heiko Carstens <heiko.carstens@de.ibm.com> 94bfc86ceSHeiko Carstens */ 104bfc86ceSHeiko Carstens 114bfc86ceSHeiko Carstens#include <linux/init.h> 124bfc86ceSHeiko Carstens#include <linux/linkage.h> 134bfc86ceSHeiko Carstens#include <asm/processor.h> 144bfc86ceSHeiko Carstens#include <asm/cache.h> 154bfc86ceSHeiko Carstens#include <asm/errno.h> 164bfc86ceSHeiko Carstens#include <asm/ptrace.h> 174bfc86ceSHeiko Carstens#include <asm/thread_info.h> 184bfc86ceSHeiko Carstens#include <asm/asm-offsets.h> 194bfc86ceSHeiko Carstens#include <asm/unistd.h> 204bfc86ceSHeiko Carstens#include <asm/page.h> 214bfc86ceSHeiko Carstens#include <asm/sigp.h> 224bfc86ceSHeiko Carstens#include <asm/irq.h> 234bfc86ceSHeiko Carstens 244bfc86ceSHeiko Carstens__PT_R0 = __PT_GPRS 254bfc86ceSHeiko Carstens__PT_R1 = __PT_GPRS + 8 264bfc86ceSHeiko Carstens__PT_R2 = __PT_GPRS + 16 274bfc86ceSHeiko Carstens__PT_R3 = __PT_GPRS + 24 284bfc86ceSHeiko Carstens__PT_R4 = __PT_GPRS + 32 294bfc86ceSHeiko Carstens__PT_R5 = __PT_GPRS + 40 304bfc86ceSHeiko Carstens__PT_R6 = __PT_GPRS + 48 314bfc86ceSHeiko Carstens__PT_R7 = __PT_GPRS + 56 324bfc86ceSHeiko Carstens__PT_R8 = __PT_GPRS + 64 334bfc86ceSHeiko Carstens__PT_R9 = __PT_GPRS + 72 344bfc86ceSHeiko Carstens__PT_R10 = __PT_GPRS + 80 354bfc86ceSHeiko Carstens__PT_R11 = __PT_GPRS + 88 364bfc86ceSHeiko Carstens__PT_R12 = __PT_GPRS + 96 374bfc86ceSHeiko Carstens__PT_R13 = __PT_GPRS + 104 384bfc86ceSHeiko Carstens__PT_R14 = __PT_GPRS + 112 394bfc86ceSHeiko Carstens__PT_R15 = __PT_GPRS + 120 404bfc86ceSHeiko Carstens 414bfc86ceSHeiko CarstensSTACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 424bfc86ceSHeiko CarstensSTACK_SIZE = 1 << STACK_SHIFT 434bfc86ceSHeiko CarstensSTACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE 444bfc86ceSHeiko Carstens 454bfc86ceSHeiko Carstens_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 464bfc86ceSHeiko Carstens _TIF_UPROBE) 474bfc86ceSHeiko Carstens_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 484bfc86ceSHeiko Carstens _TIF_SYSCALL_TRACEPOINT) 494bfc86ceSHeiko Carstens_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE) 504bfc86ceSHeiko Carstens_PIF_WORK = (_PIF_PER_TRAP) 514bfc86ceSHeiko Carstens 524bfc86ceSHeiko Carstens#define BASED(name) name-system_call(%r13) 534bfc86ceSHeiko Carstens 544bfc86ceSHeiko Carstens .macro TRACE_IRQS_ON 554bfc86ceSHeiko Carstens#ifdef CONFIG_TRACE_IRQFLAGS 564bfc86ceSHeiko Carstens basr %r2,%r0 574bfc86ceSHeiko Carstens brasl %r14,trace_hardirqs_on_caller 584bfc86ceSHeiko Carstens#endif 594bfc86ceSHeiko Carstens .endm 604bfc86ceSHeiko Carstens 614bfc86ceSHeiko Carstens .macro TRACE_IRQS_OFF 624bfc86ceSHeiko Carstens#ifdef CONFIG_TRACE_IRQFLAGS 634bfc86ceSHeiko Carstens basr %r2,%r0 644bfc86ceSHeiko Carstens brasl %r14,trace_hardirqs_off_caller 654bfc86ceSHeiko Carstens#endif 664bfc86ceSHeiko Carstens .endm 674bfc86ceSHeiko Carstens 684bfc86ceSHeiko Carstens .macro LOCKDEP_SYS_EXIT 694bfc86ceSHeiko Carstens#ifdef CONFIG_LOCKDEP 704bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 714bfc86ceSHeiko Carstens jz .+10 724bfc86ceSHeiko Carstens brasl %r14,lockdep_sys_exit 734bfc86ceSHeiko Carstens#endif 744bfc86ceSHeiko Carstens .endm 754bfc86ceSHeiko Carstens 764bfc86ceSHeiko Carstens .macro LPP newpp 774bfc86ceSHeiko Carstens#if IS_ENABLED(CONFIG_KVM) 784bfc86ceSHeiko Carstens tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_LPP 794bfc86ceSHeiko Carstens jz .+8 804bfc86ceSHeiko Carstens .insn s,0xb2800000,\newpp 814bfc86ceSHeiko Carstens#endif 824bfc86ceSHeiko Carstens .endm 834bfc86ceSHeiko Carstens 844bfc86ceSHeiko Carstens .macro HANDLE_SIE_INTERCEPT scratch,reason 854bfc86ceSHeiko Carstens#if IS_ENABLED(CONFIG_KVM) 864bfc86ceSHeiko Carstens tmhh %r8,0x0001 # interrupting from user ? 874bfc86ceSHeiko Carstens jnz .+62 884bfc86ceSHeiko Carstens lgr \scratch,%r9 894bfc86ceSHeiko Carstens slg \scratch,BASED(.Lsie_critical) 904bfc86ceSHeiko Carstens clg \scratch,BASED(.Lsie_critical_length) 914bfc86ceSHeiko Carstens .if \reason==1 924bfc86ceSHeiko Carstens # Some program interrupts are suppressing (e.g. protection). 934bfc86ceSHeiko Carstens # We must also check the instruction after SIE in that case. 944bfc86ceSHeiko Carstens # do_protection_exception will rewind to .Lrewind_pad 954bfc86ceSHeiko Carstens jh .+42 964bfc86ceSHeiko Carstens .else 974bfc86ceSHeiko Carstens jhe .+42 984bfc86ceSHeiko Carstens .endif 994bfc86ceSHeiko Carstens lg %r14,__SF_EMPTY(%r15) # get control block pointer 1004bfc86ceSHeiko Carstens LPP __SF_EMPTY+16(%r15) # set host id 1014bfc86ceSHeiko Carstens ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE 1024bfc86ceSHeiko Carstens lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 1034bfc86ceSHeiko Carstens larl %r9,sie_exit # skip forward to sie_exit 1044bfc86ceSHeiko Carstens mvi __SF_EMPTY+31(%r15),\reason # set exit reason 1054bfc86ceSHeiko Carstens#endif 1064bfc86ceSHeiko Carstens .endm 1074bfc86ceSHeiko Carstens 1084bfc86ceSHeiko Carstens .macro CHECK_STACK stacksize,savearea 1094bfc86ceSHeiko Carstens#ifdef CONFIG_CHECK_STACK 1104bfc86ceSHeiko Carstens tml %r15,\stacksize - CONFIG_STACK_GUARD 1114bfc86ceSHeiko Carstens lghi %r14,\savearea 1124bfc86ceSHeiko Carstens jz stack_overflow 1134bfc86ceSHeiko Carstens#endif 1144bfc86ceSHeiko Carstens .endm 1154bfc86ceSHeiko Carstens 1164bfc86ceSHeiko Carstens .macro SWITCH_ASYNC savearea,stack,shift 1174bfc86ceSHeiko Carstens tmhh %r8,0x0001 # interrupting from user ? 1184bfc86ceSHeiko Carstens jnz 1f 1194bfc86ceSHeiko Carstens lgr %r14,%r9 1204bfc86ceSHeiko Carstens slg %r14,BASED(.Lcritical_start) 1214bfc86ceSHeiko Carstens clg %r14,BASED(.Lcritical_length) 1224bfc86ceSHeiko Carstens jhe 0f 1234bfc86ceSHeiko Carstens lghi %r11,\savearea # inside critical section, do cleanup 1244bfc86ceSHeiko Carstens brasl %r14,cleanup_critical 1254bfc86ceSHeiko Carstens tmhh %r8,0x0001 # retest problem state after cleanup 1264bfc86ceSHeiko Carstens jnz 1f 1274bfc86ceSHeiko Carstens0: lg %r14,\stack # are we already on the target stack? 1284bfc86ceSHeiko Carstens slgr %r14,%r15 1294bfc86ceSHeiko Carstens srag %r14,%r14,\shift 1304bfc86ceSHeiko Carstens jnz 1f 1314bfc86ceSHeiko Carstens CHECK_STACK 1<<\shift,\savearea 1324bfc86ceSHeiko Carstens aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 1334bfc86ceSHeiko Carstens j 2f 1344bfc86ceSHeiko Carstens1: lg %r15,\stack # load target stack 1354bfc86ceSHeiko Carstens2: la %r11,STACK_FRAME_OVERHEAD(%r15) 1364bfc86ceSHeiko Carstens .endm 1374bfc86ceSHeiko Carstens 1384bfc86ceSHeiko Carstens .macro UPDATE_VTIME scratch,enter_timer 1394bfc86ceSHeiko Carstens lg \scratch,__LC_EXIT_TIMER 1404bfc86ceSHeiko Carstens slg \scratch,\enter_timer 1414bfc86ceSHeiko Carstens alg \scratch,__LC_USER_TIMER 1424bfc86ceSHeiko Carstens stg \scratch,__LC_USER_TIMER 1434bfc86ceSHeiko Carstens lg \scratch,__LC_LAST_UPDATE_TIMER 1444bfc86ceSHeiko Carstens slg \scratch,__LC_EXIT_TIMER 1454bfc86ceSHeiko Carstens alg \scratch,__LC_SYSTEM_TIMER 1464bfc86ceSHeiko Carstens stg \scratch,__LC_SYSTEM_TIMER 1474bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer 1484bfc86ceSHeiko Carstens .endm 1494bfc86ceSHeiko Carstens 1504bfc86ceSHeiko Carstens .macro LAST_BREAK scratch 1514bfc86ceSHeiko Carstens srag \scratch,%r10,23 1524bfc86ceSHeiko Carstens jz .+10 1534bfc86ceSHeiko Carstens stg %r10,__TI_last_break(%r12) 1544bfc86ceSHeiko Carstens .endm 1554bfc86ceSHeiko Carstens 1564bfc86ceSHeiko Carstens .macro REENABLE_IRQS 1574bfc86ceSHeiko Carstens stg %r8,__LC_RETURN_PSW 1584bfc86ceSHeiko Carstens ni __LC_RETURN_PSW,0xbf 1594bfc86ceSHeiko Carstens ssm __LC_RETURN_PSW 1604bfc86ceSHeiko Carstens .endm 1614bfc86ceSHeiko Carstens 1624bfc86ceSHeiko Carstens .macro STCK savearea 1634bfc86ceSHeiko Carstens#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 1644bfc86ceSHeiko Carstens .insn s,0xb27c0000,\savearea # store clock fast 1654bfc86ceSHeiko Carstens#else 1664bfc86ceSHeiko Carstens .insn s,0xb2050000,\savearea # store clock 1674bfc86ceSHeiko Carstens#endif 1684bfc86ceSHeiko Carstens .endm 1694bfc86ceSHeiko Carstens 1704bfc86ceSHeiko Carstens .section .kprobes.text, "ax" 1714bfc86ceSHeiko Carstens 1724bfc86ceSHeiko Carstens/* 1734bfc86ceSHeiko Carstens * Scheduler resume function, called by switch_to 1744bfc86ceSHeiko Carstens * gpr2 = (task_struct *) prev 1754bfc86ceSHeiko Carstens * gpr3 = (task_struct *) next 1764bfc86ceSHeiko Carstens * Returns: 1774bfc86ceSHeiko Carstens * gpr2 = prev 1784bfc86ceSHeiko Carstens */ 1794bfc86ceSHeiko CarstensENTRY(__switch_to) 1804bfc86ceSHeiko Carstens stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task 181*3827ec3dSMartin Schwidefsky lgr %r1,%r2 182*3827ec3dSMartin Schwidefsky aghi %r1,__TASK_thread # thread_struct of prev task 183*3827ec3dSMartin Schwidefsky lg %r4,__TASK_thread_info(%r2) # get thread_info of prev 184*3827ec3dSMartin Schwidefsky lg %r5,__TASK_thread_info(%r3) # get thread_info of next 185*3827ec3dSMartin Schwidefsky stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev 186*3827ec3dSMartin Schwidefsky lgr %r1,%r3 187*3827ec3dSMartin Schwidefsky aghi %r1,__TASK_thread # thread_struct of next task 1884bfc86ceSHeiko Carstens lgr %r15,%r5 1894bfc86ceSHeiko Carstens aghi %r15,STACK_INIT # end of kernel stack of next 1904bfc86ceSHeiko Carstens stg %r3,__LC_CURRENT # store task struct of next 1914bfc86ceSHeiko Carstens stg %r5,__LC_THREAD_INFO # store thread info of next 1924bfc86ceSHeiko Carstens stg %r15,__LC_KERNEL_STACK # store end of kernel stack 193*3827ec3dSMartin Schwidefsky lg %r15,__THREAD_ksp(%r1) # load kernel stack of next 1944bfc86ceSHeiko Carstens lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 1954bfc86ceSHeiko Carstens mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next 1964bfc86ceSHeiko Carstens lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 1974bfc86ceSHeiko Carstens br %r14 1984bfc86ceSHeiko Carstens 1994bfc86ceSHeiko Carstens.L__critical_start: 2004bfc86ceSHeiko Carstens/* 2014bfc86ceSHeiko Carstens * SVC interrupt handler routine. System calls are synchronous events and 2024bfc86ceSHeiko Carstens * are executed with interrupts enabled. 2034bfc86ceSHeiko Carstens */ 2044bfc86ceSHeiko Carstens 2054bfc86ceSHeiko CarstensENTRY(system_call) 2064bfc86ceSHeiko Carstens stpt __LC_SYNC_ENTER_TIMER 2074bfc86ceSHeiko Carstens.Lsysc_stmg: 2084bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_SYNC 2094bfc86ceSHeiko Carstens lg %r10,__LC_LAST_BREAK 2104bfc86ceSHeiko Carstens lg %r12,__LC_THREAD_INFO 2114bfc86ceSHeiko Carstens lghi %r14,_PIF_SYSCALL 2124bfc86ceSHeiko Carstens.Lsysc_per: 2134bfc86ceSHeiko Carstens lg %r15,__LC_KERNEL_STACK 2144bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs 2154bfc86ceSHeiko Carstens.Lsysc_vtime: 2164bfc86ceSHeiko Carstens UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER 2174bfc86ceSHeiko Carstens LAST_BREAK %r13 2184bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 2194bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 2204bfc86ceSHeiko Carstens mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW 2214bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC 2224bfc86ceSHeiko Carstens stg %r14,__PT_FLAGS(%r11) 2234bfc86ceSHeiko Carstens.Lsysc_do_svc: 2244bfc86ceSHeiko Carstens lg %r10,__TI_sysc_table(%r12) # address of system call table 2254bfc86ceSHeiko Carstens llgh %r8,__PT_INT_CODE+2(%r11) 2264bfc86ceSHeiko Carstens slag %r8,%r8,2 # shift and test for svc 0 2274bfc86ceSHeiko Carstens jnz .Lsysc_nr_ok 2284bfc86ceSHeiko Carstens # svc 0: system call number in %r1 2294bfc86ceSHeiko Carstens llgfr %r1,%r1 # clear high word in r1 2304bfc86ceSHeiko Carstens cghi %r1,NR_syscalls 2314bfc86ceSHeiko Carstens jnl .Lsysc_nr_ok 2324bfc86ceSHeiko Carstens sth %r1,__PT_INT_CODE+2(%r11) 2334bfc86ceSHeiko Carstens slag %r8,%r1,2 2344bfc86ceSHeiko Carstens.Lsysc_nr_ok: 2354bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 2364bfc86ceSHeiko Carstens stg %r2,__PT_ORIG_GPR2(%r11) 2374bfc86ceSHeiko Carstens stg %r7,STACK_FRAME_OVERHEAD(%r15) 2384bfc86ceSHeiko Carstens lgf %r9,0(%r8,%r10) # get system call add. 2394bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_TRACE 2404bfc86ceSHeiko Carstens jnz .Lsysc_tracesys 2414bfc86ceSHeiko Carstens basr %r14,%r9 # call sys_xxxx 2424bfc86ceSHeiko Carstens stg %r2,__PT_R2(%r11) # store return value 2434bfc86ceSHeiko Carstens 2444bfc86ceSHeiko Carstens.Lsysc_return: 2454bfc86ceSHeiko Carstens LOCKDEP_SYS_EXIT 2464bfc86ceSHeiko Carstens.Lsysc_tif: 2474bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 2484bfc86ceSHeiko Carstens jno .Lsysc_restore 2494bfc86ceSHeiko Carstens tm __PT_FLAGS+7(%r11),_PIF_WORK 2504bfc86ceSHeiko Carstens jnz .Lsysc_work 2514bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_WORK 2524bfc86ceSHeiko Carstens jnz .Lsysc_work # check for work 2534bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_WORK 2544bfc86ceSHeiko Carstens jnz .Lsysc_work 2554bfc86ceSHeiko Carstens.Lsysc_restore: 2564bfc86ceSHeiko Carstens lg %r14,__LC_VDSO_PER_CPU 2574bfc86ceSHeiko Carstens lmg %r0,%r10,__PT_R0(%r11) 2584bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 2594bfc86ceSHeiko Carstens stpt __LC_EXIT_TIMER 2604bfc86ceSHeiko Carstens mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 2614bfc86ceSHeiko Carstens lmg %r11,%r15,__PT_R11(%r11) 2624bfc86ceSHeiko Carstens lpswe __LC_RETURN_PSW 2634bfc86ceSHeiko Carstens.Lsysc_done: 2644bfc86ceSHeiko Carstens 2654bfc86ceSHeiko Carstens# 2664bfc86ceSHeiko Carstens# One of the work bits is on. Find out which one. 2674bfc86ceSHeiko Carstens# 2684bfc86ceSHeiko Carstens.Lsysc_work: 2694bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 2704bfc86ceSHeiko Carstens jo .Lsysc_mcck_pending 2714bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 2724bfc86ceSHeiko Carstens jo .Lsysc_reschedule 2734bfc86ceSHeiko Carstens#ifdef CONFIG_UPROBES 2744bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_UPROBE 2754bfc86ceSHeiko Carstens jo .Lsysc_uprobe_notify 2764bfc86ceSHeiko Carstens#endif 2774bfc86ceSHeiko Carstens tm __PT_FLAGS+7(%r11),_PIF_PER_TRAP 2784bfc86ceSHeiko Carstens jo .Lsysc_singlestep 2794bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_SIGPENDING 2804bfc86ceSHeiko Carstens jo .Lsysc_sigpending 2814bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME 2824bfc86ceSHeiko Carstens jo .Lsysc_notify_resume 2834bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_ASCE 2844bfc86ceSHeiko Carstens jo .Lsysc_uaccess 2854bfc86ceSHeiko Carstens j .Lsysc_return # beware of critical section cleanup 2864bfc86ceSHeiko Carstens 2874bfc86ceSHeiko Carstens# 2884bfc86ceSHeiko Carstens# _TIF_NEED_RESCHED is set, call schedule 2894bfc86ceSHeiko Carstens# 2904bfc86ceSHeiko Carstens.Lsysc_reschedule: 2914bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 2924bfc86ceSHeiko Carstens jg schedule 2934bfc86ceSHeiko Carstens 2944bfc86ceSHeiko Carstens# 2954bfc86ceSHeiko Carstens# _CIF_MCCK_PENDING is set, call handler 2964bfc86ceSHeiko Carstens# 2974bfc86ceSHeiko Carstens.Lsysc_mcck_pending: 2984bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 2994bfc86ceSHeiko Carstens jg s390_handle_mcck # TIF bit will be cleared by handler 3004bfc86ceSHeiko Carstens 3014bfc86ceSHeiko Carstens# 3024bfc86ceSHeiko Carstens# _CIF_ASCE is set, load user space asce 3034bfc86ceSHeiko Carstens# 3044bfc86ceSHeiko Carstens.Lsysc_uaccess: 3054bfc86ceSHeiko Carstens ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 3064bfc86ceSHeiko Carstens lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 3074bfc86ceSHeiko Carstens j .Lsysc_return 3084bfc86ceSHeiko Carstens 3094bfc86ceSHeiko Carstens# 3104bfc86ceSHeiko Carstens# _TIF_SIGPENDING is set, call do_signal 3114bfc86ceSHeiko Carstens# 3124bfc86ceSHeiko Carstens.Lsysc_sigpending: 3134bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3144bfc86ceSHeiko Carstens brasl %r14,do_signal 3154bfc86ceSHeiko Carstens tm __PT_FLAGS+7(%r11),_PIF_SYSCALL 3164bfc86ceSHeiko Carstens jno .Lsysc_return 3174bfc86ceSHeiko Carstens lmg %r2,%r7,__PT_R2(%r11) # load svc arguments 3184bfc86ceSHeiko Carstens lg %r10,__TI_sysc_table(%r12) # address of system call table 3194bfc86ceSHeiko Carstens lghi %r8,0 # svc 0 returns -ENOSYS 3204bfc86ceSHeiko Carstens llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number 3214bfc86ceSHeiko Carstens cghi %r1,NR_syscalls 3224bfc86ceSHeiko Carstens jnl .Lsysc_nr_ok # invalid svc number -> do svc 0 3234bfc86ceSHeiko Carstens slag %r8,%r1,2 3244bfc86ceSHeiko Carstens j .Lsysc_nr_ok # restart svc 3254bfc86ceSHeiko Carstens 3264bfc86ceSHeiko Carstens# 3274bfc86ceSHeiko Carstens# _TIF_NOTIFY_RESUME is set, call do_notify_resume 3284bfc86ceSHeiko Carstens# 3294bfc86ceSHeiko Carstens.Lsysc_notify_resume: 3304bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3314bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3324bfc86ceSHeiko Carstens jg do_notify_resume 3334bfc86ceSHeiko Carstens 3344bfc86ceSHeiko Carstens# 3354bfc86ceSHeiko Carstens# _TIF_UPROBE is set, call uprobe_notify_resume 3364bfc86ceSHeiko Carstens# 3374bfc86ceSHeiko Carstens#ifdef CONFIG_UPROBES 3384bfc86ceSHeiko Carstens.Lsysc_uprobe_notify: 3394bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3404bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3414bfc86ceSHeiko Carstens jg uprobe_notify_resume 3424bfc86ceSHeiko Carstens#endif 3434bfc86ceSHeiko Carstens 3444bfc86ceSHeiko Carstens# 3454bfc86ceSHeiko Carstens# _PIF_PER_TRAP is set, call do_per_trap 3464bfc86ceSHeiko Carstens# 3474bfc86ceSHeiko Carstens.Lsysc_singlestep: 3484bfc86ceSHeiko Carstens ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP 3494bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3504bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3514bfc86ceSHeiko Carstens jg do_per_trap 3524bfc86ceSHeiko Carstens 3534bfc86ceSHeiko Carstens# 3544bfc86ceSHeiko Carstens# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 3554bfc86ceSHeiko Carstens# and after the system call 3564bfc86ceSHeiko Carstens# 3574bfc86ceSHeiko Carstens.Lsysc_tracesys: 3584bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3594bfc86ceSHeiko Carstens la %r3,0 3604bfc86ceSHeiko Carstens llgh %r0,__PT_INT_CODE+2(%r11) 3614bfc86ceSHeiko Carstens stg %r0,__PT_R2(%r11) 3624bfc86ceSHeiko Carstens brasl %r14,do_syscall_trace_enter 3634bfc86ceSHeiko Carstens lghi %r0,NR_syscalls 3644bfc86ceSHeiko Carstens clgr %r0,%r2 3654bfc86ceSHeiko Carstens jnh .Lsysc_tracenogo 3664bfc86ceSHeiko Carstens sllg %r8,%r2,2 3674bfc86ceSHeiko Carstens lgf %r9,0(%r8,%r10) 3684bfc86ceSHeiko Carstens.Lsysc_tracego: 3694bfc86ceSHeiko Carstens lmg %r3,%r7,__PT_R3(%r11) 3704bfc86ceSHeiko Carstens stg %r7,STACK_FRAME_OVERHEAD(%r15) 3714bfc86ceSHeiko Carstens lg %r2,__PT_ORIG_GPR2(%r11) 3724bfc86ceSHeiko Carstens basr %r14,%r9 # call sys_xxx 3734bfc86ceSHeiko Carstens stg %r2,__PT_R2(%r11) # store return value 3744bfc86ceSHeiko Carstens.Lsysc_tracenogo: 3754bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_TRACE 3764bfc86ceSHeiko Carstens jz .Lsysc_return 3774bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3784bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3794bfc86ceSHeiko Carstens jg do_syscall_trace_exit 3804bfc86ceSHeiko Carstens 3814bfc86ceSHeiko Carstens# 3824bfc86ceSHeiko Carstens# a new process exits the kernel with ret_from_fork 3834bfc86ceSHeiko Carstens# 3844bfc86ceSHeiko CarstensENTRY(ret_from_fork) 3854bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r15) 3864bfc86ceSHeiko Carstens lg %r12,__LC_THREAD_INFO 3874bfc86ceSHeiko Carstens brasl %r14,schedule_tail 3884bfc86ceSHeiko Carstens TRACE_IRQS_ON 3894bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 3904bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? 3914bfc86ceSHeiko Carstens jne .Lsysc_tracenogo 3924bfc86ceSHeiko Carstens # it's a kernel thread 3934bfc86ceSHeiko Carstens lmg %r9,%r10,__PT_R9(%r11) # load gprs 3944bfc86ceSHeiko CarstensENTRY(kernel_thread_starter) 3954bfc86ceSHeiko Carstens la %r2,0(%r10) 3964bfc86ceSHeiko Carstens basr %r14,%r9 3974bfc86ceSHeiko Carstens j .Lsysc_tracenogo 3984bfc86ceSHeiko Carstens 3994bfc86ceSHeiko Carstens/* 4004bfc86ceSHeiko Carstens * Program check handler routine 4014bfc86ceSHeiko Carstens */ 4024bfc86ceSHeiko Carstens 4034bfc86ceSHeiko CarstensENTRY(pgm_check_handler) 4044bfc86ceSHeiko Carstens stpt __LC_SYNC_ENTER_TIMER 4054bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_SYNC 4064bfc86ceSHeiko Carstens lg %r10,__LC_LAST_BREAK 4074bfc86ceSHeiko Carstens lg %r12,__LC_THREAD_INFO 4084bfc86ceSHeiko Carstens larl %r13,system_call 4094bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_PGM_OLD_PSW 4104bfc86ceSHeiko Carstens HANDLE_SIE_INTERCEPT %r14,1 4114bfc86ceSHeiko Carstens tmhh %r8,0x0001 # test problem state bit 4124bfc86ceSHeiko Carstens jnz 1f # -> fault in user space 4134bfc86ceSHeiko Carstens tmhh %r8,0x4000 # PER bit set in old PSW ? 4144bfc86ceSHeiko Carstens jnz 0f # -> enabled, can't be a double fault 4154bfc86ceSHeiko Carstens tm __LC_PGM_ILC+3,0x80 # check for per exception 4164bfc86ceSHeiko Carstens jnz .Lpgm_svcper # -> single stepped svc 4174bfc86ceSHeiko Carstens0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC 4184bfc86ceSHeiko Carstens aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 4194bfc86ceSHeiko Carstens j 2f 4204bfc86ceSHeiko Carstens1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER 4214bfc86ceSHeiko Carstens LAST_BREAK %r14 4224bfc86ceSHeiko Carstens lg %r15,__LC_KERNEL_STACK 4234bfc86ceSHeiko Carstens lg %r14,__TI_task(%r12) 424*3827ec3dSMartin Schwidefsky aghi %r14,__TASK_thread # pointer to thread_struct 4254bfc86ceSHeiko Carstens lghi %r13,__LC_PGM_TDB 4264bfc86ceSHeiko Carstens tm __LC_PGM_ILC+2,0x02 # check for transaction abort 4274bfc86ceSHeiko Carstens jz 2f 4284bfc86ceSHeiko Carstens mvc __THREAD_trap_tdb(256,%r14),0(%r13) 4294bfc86ceSHeiko Carstens2: la %r11,STACK_FRAME_OVERHEAD(%r15) 4304bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 4314bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 4324bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 4334bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC 4344bfc86ceSHeiko Carstens mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE 4354bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 4364bfc86ceSHeiko Carstens stg %r10,__PT_ARGS(%r11) 4374bfc86ceSHeiko Carstens tm __LC_PGM_ILC+3,0x80 # check for per exception 4384bfc86ceSHeiko Carstens jz 0f 4394bfc86ceSHeiko Carstens tmhh %r8,0x0001 # kernel per event ? 4404bfc86ceSHeiko Carstens jz .Lpgm_kprobe 4414bfc86ceSHeiko Carstens oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP 4424bfc86ceSHeiko Carstens mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS 4434bfc86ceSHeiko Carstens mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE 4444bfc86ceSHeiko Carstens mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID 4454bfc86ceSHeiko Carstens0: REENABLE_IRQS 4464bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 4474bfc86ceSHeiko Carstens larl %r1,pgm_check_table 4484bfc86ceSHeiko Carstens llgh %r10,__PT_INT_CODE+2(%r11) 4494bfc86ceSHeiko Carstens nill %r10,0x007f 4504bfc86ceSHeiko Carstens sll %r10,2 4514bfc86ceSHeiko Carstens je .Lsysc_return 4524bfc86ceSHeiko Carstens lgf %r1,0(%r10,%r1) # load address of handler routine 4534bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 4544bfc86ceSHeiko Carstens basr %r14,%r1 # branch to interrupt-handler 4554bfc86ceSHeiko Carstens j .Lsysc_return 4564bfc86ceSHeiko Carstens 4574bfc86ceSHeiko Carstens# 4584bfc86ceSHeiko Carstens# PER event in supervisor state, must be kprobes 4594bfc86ceSHeiko Carstens# 4604bfc86ceSHeiko Carstens.Lpgm_kprobe: 4614bfc86ceSHeiko Carstens REENABLE_IRQS 4624bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 4634bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 4644bfc86ceSHeiko Carstens brasl %r14,do_per_trap 4654bfc86ceSHeiko Carstens j .Lsysc_return 4664bfc86ceSHeiko Carstens 4674bfc86ceSHeiko Carstens# 4684bfc86ceSHeiko Carstens# single stepped system call 4694bfc86ceSHeiko Carstens# 4704bfc86ceSHeiko Carstens.Lpgm_svcper: 4714bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW 4724bfc86ceSHeiko Carstens larl %r14,.Lsysc_per 4734bfc86ceSHeiko Carstens stg %r14,__LC_RETURN_PSW+8 4744bfc86ceSHeiko Carstens lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP 4754bfc86ceSHeiko Carstens lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs 4764bfc86ceSHeiko Carstens 4774bfc86ceSHeiko Carstens/* 4784bfc86ceSHeiko Carstens * IO interrupt handler routine 4794bfc86ceSHeiko Carstens */ 4804bfc86ceSHeiko CarstensENTRY(io_int_handler) 4814bfc86ceSHeiko Carstens STCK __LC_INT_CLOCK 4824bfc86ceSHeiko Carstens stpt __LC_ASYNC_ENTER_TIMER 4834bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 4844bfc86ceSHeiko Carstens lg %r10,__LC_LAST_BREAK 4854bfc86ceSHeiko Carstens lg %r12,__LC_THREAD_INFO 4864bfc86ceSHeiko Carstens larl %r13,system_call 4874bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_IO_OLD_PSW 4884bfc86ceSHeiko Carstens HANDLE_SIE_INTERCEPT %r14,2 4894bfc86ceSHeiko Carstens SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT 4904bfc86ceSHeiko Carstens tmhh %r8,0x0001 # interrupting from user? 4914bfc86ceSHeiko Carstens jz .Lio_skip 4924bfc86ceSHeiko Carstens UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER 4934bfc86ceSHeiko Carstens LAST_BREAK %r14 4944bfc86ceSHeiko Carstens.Lio_skip: 4954bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 4964bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 4974bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 4984bfc86ceSHeiko Carstens mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 4994bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 5004bfc86ceSHeiko Carstens TRACE_IRQS_OFF 5014bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 5024bfc86ceSHeiko Carstens.Lio_loop: 5034bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 5044bfc86ceSHeiko Carstens lghi %r3,IO_INTERRUPT 5054bfc86ceSHeiko Carstens tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? 5064bfc86ceSHeiko Carstens jz .Lio_call 5074bfc86ceSHeiko Carstens lghi %r3,THIN_INTERRUPT 5084bfc86ceSHeiko Carstens.Lio_call: 5094bfc86ceSHeiko Carstens brasl %r14,do_IRQ 5104bfc86ceSHeiko Carstens tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR 5114bfc86ceSHeiko Carstens jz .Lio_return 5124bfc86ceSHeiko Carstens tpi 0 5134bfc86ceSHeiko Carstens jz .Lio_return 5144bfc86ceSHeiko Carstens mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 5154bfc86ceSHeiko Carstens j .Lio_loop 5164bfc86ceSHeiko Carstens.Lio_return: 5174bfc86ceSHeiko Carstens LOCKDEP_SYS_EXIT 5184bfc86ceSHeiko Carstens TRACE_IRQS_ON 5194bfc86ceSHeiko Carstens.Lio_tif: 5204bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_WORK 5214bfc86ceSHeiko Carstens jnz .Lio_work # there is work to do (signals etc.) 5224bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_WORK 5234bfc86ceSHeiko Carstens jnz .Lio_work 5244bfc86ceSHeiko Carstens.Lio_restore: 5254bfc86ceSHeiko Carstens lg %r14,__LC_VDSO_PER_CPU 5264bfc86ceSHeiko Carstens lmg %r0,%r10,__PT_R0(%r11) 5274bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 5284bfc86ceSHeiko Carstens stpt __LC_EXIT_TIMER 5294bfc86ceSHeiko Carstens mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 5304bfc86ceSHeiko Carstens lmg %r11,%r15,__PT_R11(%r11) 5314bfc86ceSHeiko Carstens lpswe __LC_RETURN_PSW 5324bfc86ceSHeiko Carstens.Lio_done: 5334bfc86ceSHeiko Carstens 5344bfc86ceSHeiko Carstens# 5354bfc86ceSHeiko Carstens# There is work todo, find out in which context we have been interrupted: 5364bfc86ceSHeiko Carstens# 1) if we return to user space we can do all _TIF_WORK work 5374bfc86ceSHeiko Carstens# 2) if we return to kernel code and kvm is enabled check if we need to 5384bfc86ceSHeiko Carstens# modify the psw to leave SIE 5394bfc86ceSHeiko Carstens# 3) if we return to kernel code and preemptive scheduling is enabled check 5404bfc86ceSHeiko Carstens# the preemption counter and if it is zero call preempt_schedule_irq 5414bfc86ceSHeiko Carstens# Before any work can be done, a switch to the kernel stack is required. 5424bfc86ceSHeiko Carstens# 5434bfc86ceSHeiko Carstens.Lio_work: 5444bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 5454bfc86ceSHeiko Carstens jo .Lio_work_user # yes -> do resched & signal 5464bfc86ceSHeiko Carstens#ifdef CONFIG_PREEMPT 5474bfc86ceSHeiko Carstens # check for preemptive scheduling 5484bfc86ceSHeiko Carstens icm %r0,15,__TI_precount(%r12) 5494bfc86ceSHeiko Carstens jnz .Lio_restore # preemption is disabled 5504bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 5514bfc86ceSHeiko Carstens jno .Lio_restore 5524bfc86ceSHeiko Carstens # switch to kernel stack 5534bfc86ceSHeiko Carstens lg %r1,__PT_R15(%r11) 5544bfc86ceSHeiko Carstens aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 5554bfc86ceSHeiko Carstens mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 5564bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 5574bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r1) 5584bfc86ceSHeiko Carstens lgr %r15,%r1 5594bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return, call 5604bfc86ceSHeiko Carstens # TRACE_IRQS_OFF to keep things symmetrical 5614bfc86ceSHeiko Carstens TRACE_IRQS_OFF 5624bfc86ceSHeiko Carstens brasl %r14,preempt_schedule_irq 5634bfc86ceSHeiko Carstens j .Lio_return 5644bfc86ceSHeiko Carstens#else 5654bfc86ceSHeiko Carstens j .Lio_restore 5664bfc86ceSHeiko Carstens#endif 5674bfc86ceSHeiko Carstens 5684bfc86ceSHeiko Carstens# 5694bfc86ceSHeiko Carstens# Need to do work before returning to userspace, switch to kernel stack 5704bfc86ceSHeiko Carstens# 5714bfc86ceSHeiko Carstens.Lio_work_user: 5724bfc86ceSHeiko Carstens lg %r1,__LC_KERNEL_STACK 5734bfc86ceSHeiko Carstens mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 5744bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 5754bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r1) 5764bfc86ceSHeiko Carstens lgr %r15,%r1 5774bfc86ceSHeiko Carstens 5784bfc86ceSHeiko Carstens# 5794bfc86ceSHeiko Carstens# One of the work bits is on. Find out which one. 5804bfc86ceSHeiko Carstens# 5814bfc86ceSHeiko Carstens.Lio_work_tif: 5824bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 5834bfc86ceSHeiko Carstens jo .Lio_mcck_pending 5844bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 5854bfc86ceSHeiko Carstens jo .Lio_reschedule 5864bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_SIGPENDING 5874bfc86ceSHeiko Carstens jo .Lio_sigpending 5884bfc86ceSHeiko Carstens tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME 5894bfc86ceSHeiko Carstens jo .Lio_notify_resume 5904bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_ASCE 5914bfc86ceSHeiko Carstens jo .Lio_uaccess 5924bfc86ceSHeiko Carstens j .Lio_return # beware of critical section cleanup 5934bfc86ceSHeiko Carstens 5944bfc86ceSHeiko Carstens# 5954bfc86ceSHeiko Carstens# _CIF_MCCK_PENDING is set, call handler 5964bfc86ceSHeiko Carstens# 5974bfc86ceSHeiko Carstens.Lio_mcck_pending: 5984bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 5994bfc86ceSHeiko Carstens brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler 6004bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6014bfc86ceSHeiko Carstens j .Lio_return 6024bfc86ceSHeiko Carstens 6034bfc86ceSHeiko Carstens# 6044bfc86ceSHeiko Carstens# _CIF_ASCE is set, load user space asce 6054bfc86ceSHeiko Carstens# 6064bfc86ceSHeiko Carstens.Lio_uaccess: 6074bfc86ceSHeiko Carstens ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 6084bfc86ceSHeiko Carstens lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 6094bfc86ceSHeiko Carstens j .Lio_return 6104bfc86ceSHeiko Carstens 6114bfc86ceSHeiko Carstens# 6124bfc86ceSHeiko Carstens# _TIF_NEED_RESCHED is set, call schedule 6134bfc86ceSHeiko Carstens# 6144bfc86ceSHeiko Carstens.Lio_reschedule: 6154bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 6164bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 6174bfc86ceSHeiko Carstens brasl %r14,schedule # call scheduler 6184bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 6194bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6204bfc86ceSHeiko Carstens j .Lio_return 6214bfc86ceSHeiko Carstens 6224bfc86ceSHeiko Carstens# 6234bfc86ceSHeiko Carstens# _TIF_SIGPENDING or is set, call do_signal 6244bfc86ceSHeiko Carstens# 6254bfc86ceSHeiko Carstens.Lio_sigpending: 6264bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 6274bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 6284bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 6294bfc86ceSHeiko Carstens brasl %r14,do_signal 6304bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 6314bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6324bfc86ceSHeiko Carstens j .Lio_return 6334bfc86ceSHeiko Carstens 6344bfc86ceSHeiko Carstens# 6354bfc86ceSHeiko Carstens# _TIF_NOTIFY_RESUME or is set, call do_notify_resume 6364bfc86ceSHeiko Carstens# 6374bfc86ceSHeiko Carstens.Lio_notify_resume: 6384bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 6394bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 6404bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 6414bfc86ceSHeiko Carstens brasl %r14,do_notify_resume 6424bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 6434bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6444bfc86ceSHeiko Carstens j .Lio_return 6454bfc86ceSHeiko Carstens 6464bfc86ceSHeiko Carstens/* 6474bfc86ceSHeiko Carstens * External interrupt handler routine 6484bfc86ceSHeiko Carstens */ 6494bfc86ceSHeiko CarstensENTRY(ext_int_handler) 6504bfc86ceSHeiko Carstens STCK __LC_INT_CLOCK 6514bfc86ceSHeiko Carstens stpt __LC_ASYNC_ENTER_TIMER 6524bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 6534bfc86ceSHeiko Carstens lg %r10,__LC_LAST_BREAK 6544bfc86ceSHeiko Carstens lg %r12,__LC_THREAD_INFO 6554bfc86ceSHeiko Carstens larl %r13,system_call 6564bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_EXT_OLD_PSW 6574bfc86ceSHeiko Carstens HANDLE_SIE_INTERCEPT %r14,3 6584bfc86ceSHeiko Carstens SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT 6594bfc86ceSHeiko Carstens tmhh %r8,0x0001 # interrupting from user ? 6604bfc86ceSHeiko Carstens jz .Lext_skip 6614bfc86ceSHeiko Carstens UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER 6624bfc86ceSHeiko Carstens LAST_BREAK %r14 6634bfc86ceSHeiko Carstens.Lext_skip: 6644bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 6654bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 6664bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 6674bfc86ceSHeiko Carstens lghi %r1,__LC_EXT_PARAMS2 6684bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR 6694bfc86ceSHeiko Carstens mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS 6704bfc86ceSHeiko Carstens mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) 6714bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 6724bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6734bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 6744bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 6754bfc86ceSHeiko Carstens lghi %r3,EXT_INTERRUPT 6764bfc86ceSHeiko Carstens brasl %r14,do_IRQ 6774bfc86ceSHeiko Carstens j .Lio_return 6784bfc86ceSHeiko Carstens 6794bfc86ceSHeiko Carstens/* 6804bfc86ceSHeiko Carstens * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. 6814bfc86ceSHeiko Carstens */ 6824bfc86ceSHeiko CarstensENTRY(psw_idle) 6834bfc86ceSHeiko Carstens stg %r3,__SF_EMPTY(%r15) 6844bfc86ceSHeiko Carstens larl %r1,.Lpsw_idle_lpsw+4 6854bfc86ceSHeiko Carstens stg %r1,__SF_EMPTY+8(%r15) 6864bfc86ceSHeiko Carstens STCK __CLOCK_IDLE_ENTER(%r2) 6874bfc86ceSHeiko Carstens stpt __TIMER_IDLE_ENTER(%r2) 6884bfc86ceSHeiko Carstens.Lpsw_idle_lpsw: 6894bfc86ceSHeiko Carstens lpswe __SF_EMPTY(%r15) 6904bfc86ceSHeiko Carstens br %r14 6914bfc86ceSHeiko Carstens.Lpsw_idle_end: 6924bfc86ceSHeiko Carstens 6934bfc86ceSHeiko Carstens.L__critical_end: 6944bfc86ceSHeiko Carstens 6954bfc86ceSHeiko Carstens/* 6964bfc86ceSHeiko Carstens * Machine check handler routines 6974bfc86ceSHeiko Carstens */ 6984bfc86ceSHeiko CarstensENTRY(mcck_int_handler) 6994bfc86ceSHeiko Carstens STCK __LC_MCCK_CLOCK 7004bfc86ceSHeiko Carstens la %r1,4095 # revalidate r1 7014bfc86ceSHeiko Carstens spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer 7024bfc86ceSHeiko Carstens lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs 7034bfc86ceSHeiko Carstens lg %r10,__LC_LAST_BREAK 7044bfc86ceSHeiko Carstens lg %r12,__LC_THREAD_INFO 7054bfc86ceSHeiko Carstens larl %r13,system_call 7064bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_MCK_OLD_PSW 7074bfc86ceSHeiko Carstens HANDLE_SIE_INTERCEPT %r14,4 7084bfc86ceSHeiko Carstens tm __LC_MCCK_CODE,0x80 # system damage? 7094bfc86ceSHeiko Carstens jo .Lmcck_panic # yes -> rest of mcck code invalid 7104bfc86ceSHeiko Carstens lghi %r14,__LC_CPU_TIMER_SAVE_AREA 7114bfc86ceSHeiko Carstens mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7124bfc86ceSHeiko Carstens tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 7134bfc86ceSHeiko Carstens jo 3f 7144bfc86ceSHeiko Carstens la %r14,__LC_SYNC_ENTER_TIMER 7154bfc86ceSHeiko Carstens clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 7164bfc86ceSHeiko Carstens jl 0f 7174bfc86ceSHeiko Carstens la %r14,__LC_ASYNC_ENTER_TIMER 7184bfc86ceSHeiko Carstens0: clc 0(8,%r14),__LC_EXIT_TIMER 7194bfc86ceSHeiko Carstens jl 1f 7204bfc86ceSHeiko Carstens la %r14,__LC_EXIT_TIMER 7214bfc86ceSHeiko Carstens1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 7224bfc86ceSHeiko Carstens jl 2f 7234bfc86ceSHeiko Carstens la %r14,__LC_LAST_UPDATE_TIMER 7244bfc86ceSHeiko Carstens2: spt 0(%r14) 7254bfc86ceSHeiko Carstens mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7264bfc86ceSHeiko Carstens3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 7274bfc86ceSHeiko Carstens jno .Lmcck_panic # no -> skip cleanup critical 7284bfc86ceSHeiko Carstens SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT 7294bfc86ceSHeiko Carstens tm %r8,0x0001 # interrupting from user ? 7304bfc86ceSHeiko Carstens jz .Lmcck_skip 7314bfc86ceSHeiko Carstens UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER 7324bfc86ceSHeiko Carstens LAST_BREAK %r14 7334bfc86ceSHeiko Carstens.Lmcck_skip: 7344bfc86ceSHeiko Carstens lghi %r14,__LC_GPREGS_SAVE_AREA+64 7354bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 7364bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),0(%r14) 7374bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 7384bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 7394bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 7404bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 7414bfc86ceSHeiko Carstens brasl %r14,s390_do_machine_check 7424bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 7434bfc86ceSHeiko Carstens jno .Lmcck_return 7444bfc86ceSHeiko Carstens lg %r1,__LC_KERNEL_STACK # switch to kernel stack 7454bfc86ceSHeiko Carstens mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 7464bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 7474bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r1) 7484bfc86ceSHeiko Carstens lgr %r15,%r1 7494bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off 7504bfc86ceSHeiko Carstens tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 7514bfc86ceSHeiko Carstens jno .Lmcck_return 7524bfc86ceSHeiko Carstens TRACE_IRQS_OFF 7534bfc86ceSHeiko Carstens brasl %r14,s390_handle_mcck 7544bfc86ceSHeiko Carstens TRACE_IRQS_ON 7554bfc86ceSHeiko Carstens.Lmcck_return: 7564bfc86ceSHeiko Carstens lg %r14,__LC_VDSO_PER_CPU 7574bfc86ceSHeiko Carstens lmg %r0,%r10,__PT_R0(%r11) 7584bfc86ceSHeiko Carstens mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW 7594bfc86ceSHeiko Carstens tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 7604bfc86ceSHeiko Carstens jno 0f 7614bfc86ceSHeiko Carstens stpt __LC_EXIT_TIMER 7624bfc86ceSHeiko Carstens mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 7634bfc86ceSHeiko Carstens0: lmg %r11,%r15,__PT_R11(%r11) 7644bfc86ceSHeiko Carstens lpswe __LC_RETURN_MCCK_PSW 7654bfc86ceSHeiko Carstens 7664bfc86ceSHeiko Carstens.Lmcck_panic: 7674bfc86ceSHeiko Carstens lg %r14,__LC_PANIC_STACK 7684bfc86ceSHeiko Carstens slgr %r14,%r15 7694bfc86ceSHeiko Carstens srag %r14,%r14,PAGE_SHIFT 7704bfc86ceSHeiko Carstens jz 0f 7714bfc86ceSHeiko Carstens lg %r15,__LC_PANIC_STACK 7724bfc86ceSHeiko Carstens0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 7734bfc86ceSHeiko Carstens j .Lmcck_skip 7744bfc86ceSHeiko Carstens 7754bfc86ceSHeiko Carstens# 7764bfc86ceSHeiko Carstens# PSW restart interrupt handler 7774bfc86ceSHeiko Carstens# 7784bfc86ceSHeiko CarstensENTRY(restart_int_handler) 7794bfc86ceSHeiko Carstens stg %r15,__LC_SAVE_AREA_RESTART 7804bfc86ceSHeiko Carstens lg %r15,__LC_RESTART_STACK 7814bfc86ceSHeiko Carstens aghi %r15,-__PT_SIZE # create pt_regs on stack 7824bfc86ceSHeiko Carstens xc 0(__PT_SIZE,%r15),0(%r15) 7834bfc86ceSHeiko Carstens stmg %r0,%r14,__PT_R0(%r15) 7844bfc86ceSHeiko Carstens mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART 7854bfc86ceSHeiko Carstens mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw 7864bfc86ceSHeiko Carstens aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack 7874bfc86ceSHeiko Carstens xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) 7884bfc86ceSHeiko Carstens lg %r1,__LC_RESTART_FN # load fn, parm & source cpu 7894bfc86ceSHeiko Carstens lg %r2,__LC_RESTART_DATA 7904bfc86ceSHeiko Carstens lg %r3,__LC_RESTART_SOURCE 7914bfc86ceSHeiko Carstens ltgr %r3,%r3 # test source cpu address 7924bfc86ceSHeiko Carstens jm 1f # negative -> skip source stop 7934bfc86ceSHeiko Carstens0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu 7944bfc86ceSHeiko Carstens brc 10,0b # wait for status stored 7954bfc86ceSHeiko Carstens1: basr %r14,%r1 # call function 7964bfc86ceSHeiko Carstens stap __SF_EMPTY(%r15) # store cpu address 7974bfc86ceSHeiko Carstens llgh %r3,__SF_EMPTY(%r15) 7984bfc86ceSHeiko Carstens2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu 7994bfc86ceSHeiko Carstens brc 2,2b 8004bfc86ceSHeiko Carstens3: j 3b 8014bfc86ceSHeiko Carstens 8024bfc86ceSHeiko Carstens .section .kprobes.text, "ax" 8034bfc86ceSHeiko Carstens 8044bfc86ceSHeiko Carstens#ifdef CONFIG_CHECK_STACK 8054bfc86ceSHeiko Carstens/* 8064bfc86ceSHeiko Carstens * The synchronous or the asynchronous stack overflowed. We are dead. 8074bfc86ceSHeiko Carstens * No need to properly save the registers, we are going to panic anyway. 8084bfc86ceSHeiko Carstens * Setup a pt_regs so that show_trace can provide a good call trace. 8094bfc86ceSHeiko Carstens */ 8104bfc86ceSHeiko Carstensstack_overflow: 8114bfc86ceSHeiko Carstens lg %r15,__LC_PANIC_STACK # change to panic stack 8124bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r15) 8134bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 8144bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 8154bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),0(%r14) 8164bfc86ceSHeiko Carstens stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 8174bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 8184bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 8194bfc86ceSHeiko Carstens jg kernel_stack_overflow 8204bfc86ceSHeiko Carstens#endif 8214bfc86ceSHeiko Carstens 8224bfc86ceSHeiko Carstens .align 8 8234bfc86ceSHeiko Carstens.Lcleanup_table: 8244bfc86ceSHeiko Carstens .quad system_call 8254bfc86ceSHeiko Carstens .quad .Lsysc_do_svc 8264bfc86ceSHeiko Carstens .quad .Lsysc_tif 8274bfc86ceSHeiko Carstens .quad .Lsysc_restore 8284bfc86ceSHeiko Carstens .quad .Lsysc_done 8294bfc86ceSHeiko Carstens .quad .Lio_tif 8304bfc86ceSHeiko Carstens .quad .Lio_restore 8314bfc86ceSHeiko Carstens .quad .Lio_done 8324bfc86ceSHeiko Carstens .quad psw_idle 8334bfc86ceSHeiko Carstens .quad .Lpsw_idle_end 8344bfc86ceSHeiko Carstens 8354bfc86ceSHeiko Carstenscleanup_critical: 8364bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table) # system_call 8374bfc86ceSHeiko Carstens jl 0f 8384bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc 8394bfc86ceSHeiko Carstens jl .Lcleanup_system_call 8404bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif 8414bfc86ceSHeiko Carstens jl 0f 8424bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore 8434bfc86ceSHeiko Carstens jl .Lcleanup_sysc_tif 8444bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done 8454bfc86ceSHeiko Carstens jl .Lcleanup_sysc_restore 8464bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif 8474bfc86ceSHeiko Carstens jl 0f 8484bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore 8494bfc86ceSHeiko Carstens jl .Lcleanup_io_tif 8504bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+56) # .Lio_done 8514bfc86ceSHeiko Carstens jl .Lcleanup_io_restore 8524bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+64) # psw_idle 8534bfc86ceSHeiko Carstens jl 0f 8544bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end 8554bfc86ceSHeiko Carstens jl .Lcleanup_idle 8564bfc86ceSHeiko Carstens0: br %r14 8574bfc86ceSHeiko Carstens 8584bfc86ceSHeiko Carstens 8594bfc86ceSHeiko Carstens.Lcleanup_system_call: 8604bfc86ceSHeiko Carstens # check if stpt has been executed 8614bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn) 8624bfc86ceSHeiko Carstens jh 0f 8634bfc86ceSHeiko Carstens mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 8644bfc86ceSHeiko Carstens cghi %r11,__LC_SAVE_AREA_ASYNC 8654bfc86ceSHeiko Carstens je 0f 8664bfc86ceSHeiko Carstens mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 8674bfc86ceSHeiko Carstens0: # check if stmg has been executed 8684bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+8) 8694bfc86ceSHeiko Carstens jh 0f 8704bfc86ceSHeiko Carstens mvc __LC_SAVE_AREA_SYNC(64),0(%r11) 8714bfc86ceSHeiko Carstens0: # check if base register setup + TIF bit load has been done 8724bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+16) 8734bfc86ceSHeiko Carstens jhe 0f 8744bfc86ceSHeiko Carstens # set up saved registers r10 and r12 8754bfc86ceSHeiko Carstens stg %r10,16(%r11) # r10 last break 8764bfc86ceSHeiko Carstens stg %r12,32(%r11) # r12 thread-info pointer 8774bfc86ceSHeiko Carstens0: # check if the user time update has been done 8784bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+24) 8794bfc86ceSHeiko Carstens jh 0f 8804bfc86ceSHeiko Carstens lg %r15,__LC_EXIT_TIMER 8814bfc86ceSHeiko Carstens slg %r15,__LC_SYNC_ENTER_TIMER 8824bfc86ceSHeiko Carstens alg %r15,__LC_USER_TIMER 8834bfc86ceSHeiko Carstens stg %r15,__LC_USER_TIMER 8844bfc86ceSHeiko Carstens0: # check if the system time update has been done 8854bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+32) 8864bfc86ceSHeiko Carstens jh 0f 8874bfc86ceSHeiko Carstens lg %r15,__LC_LAST_UPDATE_TIMER 8884bfc86ceSHeiko Carstens slg %r15,__LC_EXIT_TIMER 8894bfc86ceSHeiko Carstens alg %r15,__LC_SYSTEM_TIMER 8904bfc86ceSHeiko Carstens stg %r15,__LC_SYSTEM_TIMER 8914bfc86ceSHeiko Carstens0: # update accounting time stamp 8924bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 8934bfc86ceSHeiko Carstens # do LAST_BREAK 8944bfc86ceSHeiko Carstens lg %r9,16(%r11) 8954bfc86ceSHeiko Carstens srag %r9,%r9,23 8964bfc86ceSHeiko Carstens jz 0f 8974bfc86ceSHeiko Carstens mvc __TI_last_break(8,%r12),16(%r11) 8984bfc86ceSHeiko Carstens0: # set up saved register r11 8994bfc86ceSHeiko Carstens lg %r15,__LC_KERNEL_STACK 9004bfc86ceSHeiko Carstens la %r9,STACK_FRAME_OVERHEAD(%r15) 9014bfc86ceSHeiko Carstens stg %r9,24(%r11) # r11 pt_regs pointer 9024bfc86ceSHeiko Carstens # fill pt_regs 9034bfc86ceSHeiko Carstens mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC 9044bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r9) 9054bfc86ceSHeiko Carstens mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW 9064bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC 9074bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) 9084bfc86ceSHeiko Carstens mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL 9094bfc86ceSHeiko Carstens # setup saved register r15 9104bfc86ceSHeiko Carstens stg %r15,56(%r11) # r15 stack pointer 9114bfc86ceSHeiko Carstens # set new psw address and exit 9124bfc86ceSHeiko Carstens larl %r9,.Lsysc_do_svc 9134bfc86ceSHeiko Carstens br %r14 9144bfc86ceSHeiko Carstens.Lcleanup_system_call_insn: 9154bfc86ceSHeiko Carstens .quad system_call 9164bfc86ceSHeiko Carstens .quad .Lsysc_stmg 9174bfc86ceSHeiko Carstens .quad .Lsysc_per 9184bfc86ceSHeiko Carstens .quad .Lsysc_vtime+18 9194bfc86ceSHeiko Carstens .quad .Lsysc_vtime+42 9204bfc86ceSHeiko Carstens 9214bfc86ceSHeiko Carstens.Lcleanup_sysc_tif: 9224bfc86ceSHeiko Carstens larl %r9,.Lsysc_tif 9234bfc86ceSHeiko Carstens br %r14 9244bfc86ceSHeiko Carstens 9254bfc86ceSHeiko Carstens.Lcleanup_sysc_restore: 9264bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_sysc_restore_insn) 9274bfc86ceSHeiko Carstens je 0f 9284bfc86ceSHeiko Carstens lg %r9,24(%r11) # get saved pointer to pt_regs 9294bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 9304bfc86ceSHeiko Carstens mvc 0(64,%r11),__PT_R8(%r9) 9314bfc86ceSHeiko Carstens lmg %r0,%r7,__PT_R0(%r9) 9324bfc86ceSHeiko Carstens0: lmg %r8,%r9,__LC_RETURN_PSW 9334bfc86ceSHeiko Carstens br %r14 9344bfc86ceSHeiko Carstens.Lcleanup_sysc_restore_insn: 9354bfc86ceSHeiko Carstens .quad .Lsysc_done - 4 9364bfc86ceSHeiko Carstens 9374bfc86ceSHeiko Carstens.Lcleanup_io_tif: 9384bfc86ceSHeiko Carstens larl %r9,.Lio_tif 9394bfc86ceSHeiko Carstens br %r14 9404bfc86ceSHeiko Carstens 9414bfc86ceSHeiko Carstens.Lcleanup_io_restore: 9424bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_io_restore_insn) 9434bfc86ceSHeiko Carstens je 0f 9444bfc86ceSHeiko Carstens lg %r9,24(%r11) # get saved r11 pointer to pt_regs 9454bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 9464bfc86ceSHeiko Carstens mvc 0(64,%r11),__PT_R8(%r9) 9474bfc86ceSHeiko Carstens lmg %r0,%r7,__PT_R0(%r9) 9484bfc86ceSHeiko Carstens0: lmg %r8,%r9,__LC_RETURN_PSW 9494bfc86ceSHeiko Carstens br %r14 9504bfc86ceSHeiko Carstens.Lcleanup_io_restore_insn: 9514bfc86ceSHeiko Carstens .quad .Lio_done - 4 9524bfc86ceSHeiko Carstens 9534bfc86ceSHeiko Carstens.Lcleanup_idle: 9544bfc86ceSHeiko Carstens # copy interrupt clock & cpu timer 9554bfc86ceSHeiko Carstens mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK 9564bfc86ceSHeiko Carstens mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER 9574bfc86ceSHeiko Carstens cghi %r11,__LC_SAVE_AREA_ASYNC 9584bfc86ceSHeiko Carstens je 0f 9594bfc86ceSHeiko Carstens mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK 9604bfc86ceSHeiko Carstens mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER 9614bfc86ceSHeiko Carstens0: # check if stck & stpt have been executed 9624bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_idle_insn) 9634bfc86ceSHeiko Carstens jhe 1f 9644bfc86ceSHeiko Carstens mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) 9654bfc86ceSHeiko Carstens mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) 9664bfc86ceSHeiko Carstens1: # account system time going idle 9674bfc86ceSHeiko Carstens lg %r9,__LC_STEAL_TIMER 9684bfc86ceSHeiko Carstens alg %r9,__CLOCK_IDLE_ENTER(%r2) 9694bfc86ceSHeiko Carstens slg %r9,__LC_LAST_UPDATE_CLOCK 9704bfc86ceSHeiko Carstens stg %r9,__LC_STEAL_TIMER 9714bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) 9724bfc86ceSHeiko Carstens lg %r9,__LC_SYSTEM_TIMER 9734bfc86ceSHeiko Carstens alg %r9,__LC_LAST_UPDATE_TIMER 9744bfc86ceSHeiko Carstens slg %r9,__TIMER_IDLE_ENTER(%r2) 9754bfc86ceSHeiko Carstens stg %r9,__LC_SYSTEM_TIMER 9764bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) 9774bfc86ceSHeiko Carstens # prepare return psw 9784bfc86ceSHeiko Carstens nihh %r8,0xfcfd # clear irq & wait state bits 9794bfc86ceSHeiko Carstens lg %r9,48(%r11) # return from psw_idle 9804bfc86ceSHeiko Carstens br %r14 9814bfc86ceSHeiko Carstens.Lcleanup_idle_insn: 9824bfc86ceSHeiko Carstens .quad .Lpsw_idle_lpsw 9834bfc86ceSHeiko Carstens 9844bfc86ceSHeiko Carstens/* 9854bfc86ceSHeiko Carstens * Integer constants 9864bfc86ceSHeiko Carstens */ 9874bfc86ceSHeiko Carstens .align 8 9884bfc86ceSHeiko Carstens.Lcritical_start: 9894bfc86ceSHeiko Carstens .quad .L__critical_start 9904bfc86ceSHeiko Carstens.Lcritical_length: 9914bfc86ceSHeiko Carstens .quad .L__critical_end - .L__critical_start 9924bfc86ceSHeiko Carstens 9934bfc86ceSHeiko Carstens 9944bfc86ceSHeiko Carstens#if IS_ENABLED(CONFIG_KVM) 9954bfc86ceSHeiko Carstens/* 9964bfc86ceSHeiko Carstens * sie64a calling convention: 9974bfc86ceSHeiko Carstens * %r2 pointer to sie control block 9984bfc86ceSHeiko Carstens * %r3 guest register save area 9994bfc86ceSHeiko Carstens */ 10004bfc86ceSHeiko CarstensENTRY(sie64a) 10014bfc86ceSHeiko Carstens stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers 10024bfc86ceSHeiko Carstens stg %r2,__SF_EMPTY(%r15) # save control block pointer 10034bfc86ceSHeiko Carstens stg %r3,__SF_EMPTY+8(%r15) # save guest register save area 10044bfc86ceSHeiko Carstens xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason 10054bfc86ceSHeiko Carstens lmg %r0,%r13,0(%r3) # load guest gprs 0-13 10064bfc86ceSHeiko Carstens lg %r14,__LC_GMAP # get gmap pointer 10074bfc86ceSHeiko Carstens ltgr %r14,%r14 10084bfc86ceSHeiko Carstens jz .Lsie_gmap 10094bfc86ceSHeiko Carstens lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce 10104bfc86ceSHeiko Carstens.Lsie_gmap: 10114bfc86ceSHeiko Carstens lg %r14,__SF_EMPTY(%r15) # get control block pointer 10124bfc86ceSHeiko Carstens oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now 10138e236546SChristian Borntraeger tm __SIE_PROG20+3(%r14),3 # last exit... 10144bfc86ceSHeiko Carstens jnz .Lsie_done 10154bfc86ceSHeiko Carstens LPP __SF_EMPTY(%r15) # set guest id 10164bfc86ceSHeiko Carstens sie 0(%r14) 10174bfc86ceSHeiko Carstens.Lsie_done: 10184bfc86ceSHeiko Carstens LPP __SF_EMPTY+16(%r15) # set host id 10194bfc86ceSHeiko Carstens ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE 10204bfc86ceSHeiko Carstens lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 10214bfc86ceSHeiko Carstens# some program checks are suppressing. C code (e.g. do_protection_exception) 10224bfc86ceSHeiko Carstens# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other 10234bfc86ceSHeiko Carstens# instructions between sie64a and .Lsie_done should not cause program 10244bfc86ceSHeiko Carstens# interrupts. So lets use a nop (47 00 00 00) as a landing pad. 10254bfc86ceSHeiko Carstens# See also HANDLE_SIE_INTERCEPT 10264bfc86ceSHeiko Carstens.Lrewind_pad: 10274bfc86ceSHeiko Carstens nop 0 10284bfc86ceSHeiko Carstens .globl sie_exit 10294bfc86ceSHeiko Carstenssie_exit: 10304bfc86ceSHeiko Carstens lg %r14,__SF_EMPTY+8(%r15) # load guest register save area 10314bfc86ceSHeiko Carstens stmg %r0,%r13,0(%r14) # save guest gprs 0-13 10324bfc86ceSHeiko Carstens lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers 10334bfc86ceSHeiko Carstens lg %r2,__SF_EMPTY+24(%r15) # return exit reason code 10344bfc86ceSHeiko Carstens br %r14 10354bfc86ceSHeiko Carstens.Lsie_fault: 10364bfc86ceSHeiko Carstens lghi %r14,-EFAULT 10374bfc86ceSHeiko Carstens stg %r14,__SF_EMPTY+24(%r15) # set exit reason code 10384bfc86ceSHeiko Carstens j sie_exit 10394bfc86ceSHeiko Carstens 10404bfc86ceSHeiko Carstens .align 8 10414bfc86ceSHeiko Carstens.Lsie_critical: 10424bfc86ceSHeiko Carstens .quad .Lsie_gmap 10434bfc86ceSHeiko Carstens.Lsie_critical_length: 10444bfc86ceSHeiko Carstens .quad .Lsie_done - .Lsie_gmap 10454bfc86ceSHeiko Carstens 10464bfc86ceSHeiko Carstens EX_TABLE(.Lrewind_pad,.Lsie_fault) 10474bfc86ceSHeiko Carstens EX_TABLE(sie_exit,.Lsie_fault) 10484bfc86ceSHeiko Carstens#endif 10494bfc86ceSHeiko Carstens 10504bfc86ceSHeiko Carstens .section .rodata, "a" 1051a876cb3fSHeiko Carstens#define SYSCALL(esame,emu) .long esame 10524bfc86ceSHeiko Carstens .globl sys_call_table 10534bfc86ceSHeiko Carstenssys_call_table: 10544bfc86ceSHeiko Carstens#include "syscalls.S" 10554bfc86ceSHeiko Carstens#undef SYSCALL 10564bfc86ceSHeiko Carstens 10574bfc86ceSHeiko Carstens#ifdef CONFIG_COMPAT 10584bfc86ceSHeiko Carstens 1059a876cb3fSHeiko Carstens#define SYSCALL(esame,emu) .long emu 10604bfc86ceSHeiko Carstens .globl sys_call_table_emu 10614bfc86ceSHeiko Carstenssys_call_table_emu: 10624bfc86ceSHeiko Carstens#include "syscalls.S" 10634bfc86ceSHeiko Carstens#undef SYSCALL 10644bfc86ceSHeiko Carstens#endif 1065